assume cs:code,ds:data
data segment
		db 'ibm             '
		db 'dec             '
		db 'dos             '
		db 'vax             '
data ends

code segment
	start:
		mov ax,data
		mov ds,ax
		mov bx,0
		
		mov cx,4
	s:
		mov dx,cx
		mov si,0
		mov cx,3
	s0:
		mov al,[bx+si]
		and al,11011111b
		mov [bx+si],al
		inc si
		loop s0
		
		mov cx,dx
		add bx,16
		loop s
		
code ends
end start